how to detect copy and paste in javascript?

Question

i have two field one is emailid and another is password in my form. i want to detect that when user reenter the email and password than he should not able to copy the above. he

Answer 1

You could disable ctrl+v combination and right click as well.

for IE, you may tap into following event handlers:

onpaste="return false;" 
oncut="return false;" 
oncontextmenu="return false;" 
oncopy="return false;".

Here is a workaround for all browsers:

function noCTRL(e) {
      var code = (document.all) ? event.keyCode : e.which;
      var ctrl = (document.all) ? event.ctrlKey : e.modifiers & Event.CONTROL_MASK;
      var msg = "Sorry, this functionality is disabled.";
      if (document.all) {
        if (ctrl && code == 86) {
          //CTRL+V
          alert(msg);
          window.event.returnValue = false;
        } else if (ctrl && code == 67) { 
         //CTRL+C (Copy)
          alert(msg);
          window.event.returnValue = false;
        }
      } else {
        if (ctrl == 2) {
          //CTRL key
          alert(msg);
          return false;
        }
      }
    }

In HTML section, your fields would look like:

Email :

Password :

Confirm Email :    
Confirm Password :

I don't think user can copy password fields if input type is password

Hope this helps.

Note:

1. Disabling JavaScript in browser will let users do whatever they want
2. Always Keep this in mind: respect user's freedom.